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961.
Introduction As far as the frequency and magnitude are concerned, the earthquakes in the sea area to the east of Shanghai are far more strong than in land area with the largest one in the sea area near the Yangtze River mouth being MS=436, while in land, only MS=434 occurred on Sept. 1, 1624. As a moderately strong earthquake active area, the sea area near the Yangtze River mouth, may cause a potential risk to Shanghai. In 1971 and 1996, earthquakes with MS=5~6 occurred in this area. Geo… 相似文献
962.
IntroductionYunnanProvinceislocatedinthesouthofNorth-SouthseismiczoneinChina.ItisoneofthehighseismicactiveregionsinChinesemainland.Morethanonehundredstrongearthquakeswithmagnitude6ormoreoccurredinthisregioninhistory.AsanimportantsoutheasternmarginofTibetanPlateau,YunnanregionisahotspotinstudyonthedynamicsofTibetanPlateau.Theactionsofcompressivestressinnorth-southorientationandgravitationalpotentialcausedlateralextrusionofmaterialintheplateauwiththeupliftingofTibetanPlateau.Severalblocksa… 相似文献
963.
Introduction With the development of the seismological observation technique and deep-going of seismicdata application fields, especially the digitization of data in earthquake station networks, theimprovement of the precision, the data quantity increases as geometric order, which bringdifficulty to saving and transfering these data. To keep all information, seismic data, like medicalimages, should be compressed without error in many applications. In generally, traditionalcompression meth… 相似文献
964.
965.
滇西地区地处欧亚板块碰撞或俯冲的边界地带,曾受到多期构造运动的影响,其地质环境和构造背景十分复杂,是我国地震活动比较活跃的地区之一. 本文选用国家、地方和流动数字台网的16个台站的远震记录. 其中PASSCAL甚宽频带流动地震台站4个,提取有效接收函数近2 000条. 两条测线的直线距离分别为650 km和450 km, 横切了滇西地区的一些主要构造单元. 研究表明,怒江断裂可能是一条具有俯冲性质的缝合线. 川滇菱形块体东西两侧的分界线¾红河断裂和小江断裂可能是直立的缝合线或碰撞带. 攀西构造带仍具有大陆裂谷的特征,即地表凹陷、上地幔隆起. 滇西地区的构造格局具有一定的规律性,造山带与缝合线相间分布. 滇西地区由北向南地壳厚度渐次减薄,S波速度整体偏低. 相似文献
966.
对于大多数速度场,地震波沿射线传播的初至波走时,可以用有限差分外推的方法在二维或三维数值网格上计算出来. 在保证精度的条件下,为提高计算效率和适应性,本文推导了基于任意矩形网格和局部平面波前近似的有限差分初至波走时计算方法. 另外,该方法对首波和散射波做了合适的处理,而且不会碰到传统射线法存在的阴影区和焦散区等问题. 简单模型和复杂的Marmousi模型试算的结果表明,该方法精度较高并适用于强纵、横向变速的复杂介质. 基于该方法的Kirchhoff叠前深度偏移, 在主要构造和目的层位置的成像效果上基本达到了波动方程法叠前深度偏移的位置成像效果. 由于未考虑续至波等有效能量,在成像的保幅性上不如波动方程法叠前深度偏移的效果,但其计算效率则明显高于全格林函数法和波动方程法. 相似文献
967.
968.
969.
Study on the Impacts of Climate Change on China's Agriculture 总被引:1,自引:0,他引:1
This paper measures the economic impacts of climate change on China's agriculture based on the Ricardian model. By using county-level cross-sectional data on agricultural net revenue, climate, and other economic and geographical data for 1275 agriculture dominated counties, we find that under most climate change scenarios both higher temperature and more precipitation would have an overall positive impact on China's agriculture. However, the impacts vary seasonally and regionally. Autumn effect is the most positive, but spring effect is the most negative. Applying the model to five climate scenarios in the year 2050 shows that the East, the Central part, the South, the northern part of the Northeast, and the Plateau would benefit from climate change, but the Southwest, the Northwest and the southern part of the Northeast may be negatively affected. In the North, most scenarios show that they may benefit from climate change. In summary, all of China would benefit from climate change in most scenarios. 相似文献
970.
In this study, the relationship between fluorine in drinking water and that in urine of urban residents in China is assessed. Fluorine concentrations in tap water and those in urine show a good correlation with a linear regression coefficient of 0. 9798, indicating that the fluorine concentrations in big cities under investigation are extremely low, and the main source of fluorine is tap water. The weather effect on the intake amount of fluorine is also discussed. When air temperature is above 15℃, people would intake more fluorine through drinking water with the rise of air temperature. When temperature is below 15℃, no remarkable relationship is observed between air temperature and the intake amount of fluorine. This phenomenon indicates that the main source of fluorine in China is tap water instead of foodstuff. 相似文献